Caesar cipherCaesar cipher, is one of the simplest and most widely known encryption techniques.
The transformation can be represented by aligning two alphabets,
the cipher alphabet is the plain alphabet rotated left or right by some number of positions.
When encrypting, a person looks up each letter of the message in the 'plain'
line and writes down the corresponding letter in the 'cipher' line. Deciphering is done in reverse.
The encryption can also be represented using modular arithmetic
by first transforming the letters into numbers, according to the scheme, A = 0, B = 1,..., Z = 25.
Encryption of a letter x by a shift n can be described mathematically as
Plaintext: sylvanry

cipher variations:

tzmwbosz

uanxcpta

vboydqub

wcpzervc

xdqafswd

yerbgtxe

zfschuyf

agtdivzg

bhuejwah

civfkxbi

djwglycj

ekxhmzdk

flyinael

gmzjobfm

hnakpcgn

ioblqdho

jpcmreip

kqdnsfjq

lreotgkr

msfpuhls

ntgqvimt

ouhrwjnu

pvisxkov

qwjtylpw

rxkuzmqx

Decryption is performed similarly,
(There are different definitions for the modulo operation.
In the above, the result is in the range 0...25. I.e., if x+n or x-n are not in the range 0...25,
we have to subtract or add 26.)
Read more ...Atbash CipherAtbash is an ancient encryption system created in the Middle East.
It was originally used in the Hebrew language.
The Atbash cipher is a simple substitution cipher that relies on
transposing all the letters in the alphabet such that the resulting alphabet is backwards.
The first letter is replaced with the last letter, the second with the second-last, and so on.
An example plaintext to ciphertext using Atbash:

Baconian CipherTo encode a message, each letter of the plaintext is replaced by a group of five of the letters 'A' or 'B'.
This replacement is done according to the alphabet of the Baconian cipher, shown below.

Affine CipherIn the affine cipher the letters of an alphabet of size m are first mapped to the integers
in the range 0..m - 1. It then uses modular arithmetic to transform the integer that each plaintext
letter corresponds to into another integer that correspond to a ciphertext letter.
The encryption function for a single letter is
where modulus m is the size of the alphabet and a and b are the key of the cipher.
The value a must be chosen such that a and m are coprime.Considering the specific case of encrypting messages in English (i.e. m = 26),
there are a total of 286 non-trivial affine ciphers, not counting the 26 trivial Caesar ciphers.
This number comes from the fact there are 12 numbers that are coprime with 26 that are less than 26
(these are the possible values of a). Each value of a can have 26 different addition shifts (the b value)
; therefore, there are 12*26 or 312 possible keys.Plaintext: sylvanry

cipher variations:

tzmwbosz

dvimboav

nrecboir

xnasboqn

hjwiboyj

rfsybogf

lxkebowx

vtguboet

fpckbomp

plyaboul

zhuqboch

jdqgbokd

uanxcpta

ewjncpbw

osfdcpjs

yobtcpro

ikxjcpzk

sgtzcphg

mylfcpxy

wuhvcpfu

gqdlcpnq

qmzbcpvm

aivrcpdi

kerhcple

vboydqub

fxkodqcx

ptgedqkt

zpcudqsp

jlykdqal

thuadqih

nzmgdqyz

xviwdqgv

hremdqor

rnacdqwn

bjwsdqej

lfsidqmf

wcpzervc

gylperdy

quhferlu

aqdvertq

kmzlerbm

uivberji

oanherza

ywjxerhw

isfnerps

sobderxo

ckxterfk

mgtjerng

xdqafswd

hzmqfsez

rvigfsmv

brewfsur

lnamfscn

vjwcfskj

pboifsab

zxkyfsix

jtgofsqt

tpcefsyp

dlyufsgl

nhukfsoh

yerbgtxe

ianrgtfa

swjhgtnw

csfxgtvs

mobngtdo

wkxdgtlk

qcpjgtbc

aylzgtjy

kuhpgtru

uqdfgtzq

emzvgthm

oivlgtpi

zfschuyf

jboshugb

txkihuox

dtgyhuwt

npcohuep

xlyehuml

rdqkhucd

bzmahukz

lviqhusv

vreghuar

fnawhuin

pjwmhuqj

agtdivzg

kcptivhc

uyljivpy

euhzivxu

oqdpivfq

ymzfivnm

serlivde

canbivla

mwjrivtw

wsfhivbs

gobxivjo

qkxnivrk

bhuejwah

ldqujwid

vzmkjwqz

fviajwyv

preqjwgr

znagjwon

tfsmjwef

dbocjwmb

nxksjwux

xtgijwct

hpcyjwkp

rlyojwsl

civfkxbi

mervkxje

wanlkxra

gwjbkxzw

qsfrkxhs

aobhkxpo

ugtnkxfg

ecpdkxnc

oyltkxvy

yuhjkxdu

iqdzkxlq

smzpkxtm

djwglycj

nfswlykf

xbomlysb

hxkclyax

rtgslyit

bpcilyqp

vhuolygh

fdqelyod

pzmulywz

zviklyev

jrealymr

tnaqlyun

ekxhmzdk

ogtxmzlg

ycpnmztc

iyldmzby

suhtmzju

cqdjmzrq

wivpmzhi

gerfmzpe

qanvmzxa

awjlmzfw

ksfbmzns

uobrmzvo

flyinael

phuynamh

zdqonaud

jzmenacz

tviunakv

dreknasr

xjwqnaij

hfsgnaqf

rbownayb

bxkmnagx

ltgcnaot

vpcsnawp

gmzjobfm

qivzobni

aerpobve

kanfobda

uwjvoblw

esflobts

ykxrobjk

igthobrg

scpxobzc

cylnobhy

muhdobpu

wqdtobxq

hnakpcgn

rjwapcoj

bfsqpcwf

lbogpceb

vxkwpcmx

ftgmpcut

zlyspckl

jhuipcsh

tdqypcad

dzmopciz

nviepcqv

xreupcyr

ioblqdho

skxbqdpk

cgtrqdxg

mcphqdfc

wylxqdny

guhnqdvu

amztqdlm

kivjqdti

uerzqdbe

eanpqdja

owjfqdrw

ysfvqdzs

jpcmreip

tlycreql

dhusreyh

ndqiregd

xzmyreoz

hviorewv

bnauremn

ljwkreuj

vfsarecf

fboqrekb

pxkgresx

ztgwreat

kqdnsfjq

umzdsfrm

eivtsfzi

oerjsfhe

yanzsfpa

iwjpsfxw

cobvsfno

mkxlsfvk

wgtbsfdg

gcprsflc

qylhsfty

auhxsfbu

lreotgkr

vnaetgsn

fjwutgaj

pfsktgif

zboatgqb

jxkqtgyx

dpcwtgop

nlymtgwl

xhuctgeh

hdqstgmd

rzmitguz

bviytgcv

msfpuhls

wobfuhto

gkxvuhbk

qgtluhjg

acpbuhrc

kylruhzy

eqdxuhpq

omznuhxm

yivduhfi

iertuhne

sanjuhva

cwjzuhdw

ntgqvimt

xpcgviup

hlywvicl

rhumvikh

bdqcvisd

lzmsviaz

freyviqr

pnaoviyn

zjwevigj

jfsuviof

tbokviwb

dxkaviex

ouhrwjnu

yqdhwjvq

imzxwjdm

sivnwjli

cerdwjte

mantwjba

gsfzwjrs

qobpwjzo

akxfwjhk

kgtvwjpg

ucplwjxc

eylbwjfy

pvisxkov

zreixkwr

jnayxken

tjwoxkmj

dfsexkuf

nbouxkcb

htgaxkst

rpcqxkap

blygxkil

lhuwxkqh

vdqmxkyd

fzmcxkgz

qwjtylpw

asfjylxs

kobzylfo

ukxpylnk

egtfylvg

ocpvyldc

iuhbyltu

sqdrylbq

cmzhyljm

mivxylri

wernylze

gandylha

rxkuzmqx

btgkzmyt

lpcazmgp

vlyqzmol

fhugzmwh

pdqwzmed

jviczmuv

treszmcr

dnaizmkn

njwyzmsj

xfsozmaf

hboezmib

sylvanry

cuhlanzu

mqdbanhq

wmzranpm

givhanxi

qerxanfe

kwjdanvw

usftands

eobjanlo

okxzantk

ygtpanbg

icpfanjc

The decryption function iswhere a - 1 is the modular multiplicative inverse of a modulo m. I.e., it satisfies the equationThe multiplicative inverse of a only exists if a and m are coprime.
Hence without the restriction on a decryption might not be possible.
It can be shown as follows that decryption function is the inverse of the encryption function,Read more ...

ROT13 CipherApplying ROT13 to a piece of text merely requires examining its alphabetic
characters and replacing each one by the letter 13 places further along in the alphabet,
wrapping back to the beginning if necessary. A becomes N, B becomes O, and so on up to M,
which becomes Z, then the sequence continues at the beginning of the alphabet: N becomes A,
O becomes B, and so on to Z, which becomes M. Only those letters which occur in the English
alphabet are affected; numbers, symbols, whitespace, and all other characters are left unchanged.
Because there are 26 letters in the English alphabet and 26 = 2 * 13, the ROT13 function is its own inverse:

Polybius SquareA Polybius Square is a table that allows someone to translate letters into numbers.
To give a small level of encryption, this table can be randomized and shared with the recipient.
In order to fit the 26 letters of the alphabet into the 25 spots created by the table, the letters
i and j are usually combined.

1

2

3

4

5

1

A

B

C

D

E

2

F

G

H

I/J

K

3

L

M

N

O

P

4

Q

R

S

T

U

5

V

W

X

Y

Z

Basic Form:

Plain:

sylvanry

Cipher:

3445131511332445

Extended Methods:Method #1

Plaintext: sylvanry

method variations:

xdqafswd

civflxbi

hoalqcgo

ntfqvhmt

Method #2Bifid cipherThe message is converted to its coordinates in the usual manner, but they are written vertically beneath:

s y l v a n r y
3 4 1 1 1 3 2 4
4 5 3 5 1 3 4 5

They are then read out in rows:
3411132445351345Then divided up into pairs again, and the pairs turned back into letters using the square:

Permutation CipherIn classical cryptography, a permutation cipher is a transposition cipher in which the key is a permutation.
To apply a cipher, a random permutation of size E is generated (the larger the value of E the more secure the cipher).
The plaintext is then broken into segments of size E and the letters within that segment are permuted according to
this key.
In theory, any transposition cipher can be viewed as a permutation cipher where E is equal to the
length of the plaintext; this is too cumbersome a generalisation to use in actual practice, however.
The idea behind a permutation cipher is to keep the plaintext characters unchanged,
butalter their positions by rearrangement using a permutation
This cipher is defined as:Let m be a positive integer, and K consist of all permutations of {1,...,m}For a key (permutation) , define:
The encryption function The decryption function A small example, assuming m = 6, and the key is the permutation
:The first row is the value of i,
and the second row is the corresponding value of (i)The inverse permutation, is constructed by interchanging the two rows,
andrearranging the columns so that the first row is in increasing order, Therefore, is:
Total variation formula: e = 2,718281828 , n - plaintext length